Water Body Name: | Rock Creek (Stanislaus County) |
Water Body ID: | CAR5314000020191202046164 |
Water Body Type: | River & Stream |
DECISION ID |
131403 |
Region 5 |
Rock Creek (Stanislaus County) |
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Pollutant: | Specific Conductivity |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
Regional Board Decision Recommendation: | This decision was made by SWRCB staff. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
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LOE ID: | 229738 | ||||
Pollutant: | Specific Conductivity | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Total | ||||
Beneficial Use: | Municipal & Domestic Supply | ||||
Number of Samples: | 19 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 0 of 19 samples exceeded the water quality threshold for SpecificConductivity. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The California Secondary MCL that is incorporated by reference in the Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin for specific conductance is 900 uS/cm. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
DECISION ID |
131197 |
Region 5 |
Rock Creek (Stanislaus County) |
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Pollutant: | Temperature, water |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Pursuant to section 6.1.5.9 of the Listing Policy, this assessment utilized the upper limit of the optimal temperature range for rainbow trout for growth and completion of most life stages to interpret the narrative water quality objective for temperature. 9 of 19 samples exceeded the evaluation guideline for COLD, Fish Migration and Fish Spawning. However, the available data are insufficient to satisfy the Listing Policy requirements for spatial and temporal representation (sections 6.1.5.2 and 6.1.5.3). The surface water grab samples collected did not provide sufficient temporal and spatial representation to determine if temperature conditions experienced by aquatic life were within the optimal temperature range throughout the entire water column or the length of time temperature conditions may have exceeded the optimal temperature range. Available information for this waterbody-pollutant combination is insufficient to determine whether the aquatic beneficial use is supported. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available for this Integrated Report cycle indicating that standards are not met. However, the exceedances of the evaluation guideline indicate that beneficial uses may be threatened. This decision will be reevaluated in the next Integrated Report cycle as more data and information become available. Additional data and information may include information demonstrating that sample location(s) are representative of conditions throughout the waterbody, data from additional sampling locations, continuous monitoring data collected in the waterbody, waterbody-specific information on sensitive resident species, their life stage time frames, and the appropriate temperature thresholds necessary to support each life stage. |
Regional Board Decision Recommendation: | This decision was made by SWRCB staff. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards for the pollutant are not exceeded. |
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LOE ID: | 230484 | ||||
Pollutant: | Temperature, water | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Cold Freshwater Habitat | ||||
Number of Samples: | 19 | ||||
Number of Exceedances: | 9 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 9 of 19 samples exceeded the water quality threshold for Temperature. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129). | ||||
Guideline Reference: | Inland Fishes of California | ||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
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LOE ID: | 230313 | ||||
Pollutant: | Temperature, water | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Fish Spawning | ||||
Number of Samples: | 19 | ||||
Number of Exceedances: | 9 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 9 of 19 samples exceeded the water quality threshold for Temperature. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129). | ||||
Guideline Reference: | Inland Fishes of California | ||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
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LOE ID: | 230485 | ||||
Pollutant: | Temperature, water | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Not Recorded | ||||
Beneficial Use: | Fish Migration | ||||
Number of Samples: | 19 | ||||
Number of Exceedances: | 9 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 9 of 19 samples exceeded the water quality threshold for Temperature. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129). | ||||
Guideline Reference: | Inland Fishes of California | ||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
DECISION ID |
131196 |
Region 5 |
Rock Creek (Stanislaus County) |
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Pollutant: | pH |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of the 18 samples exceeded the OBJECTIVE for COLD, REC-1, and REC-2. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the 18 samples exceeded the OBJECTIVE for COLD, REC-1, and REC-2. This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
Regional Board Decision Recommendation: | This decision was made by SWRCB staff. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
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LOE ID: | 229515 | ||||
Pollutant: | pH | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Non-Contact Recreation | ||||
Number of Samples: | 18 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for pH. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
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LOE ID: | 229004 | ||||
Pollutant: | pH | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Water Contact Recreation | ||||
Number of Samples: | 18 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for pH. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
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LOE ID: | 229344 | ||||
Pollutant: | pH | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Cold Freshwater Habitat | ||||
Number of Samples: | 18 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 0 of 18 samples exceeded the water quality threshold for pH. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5. | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
DECISION ID |
127011 |
Region 5 |
Rock Creek (Stanislaus County) |
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Pollutant: | Indicator Bacteria |
Final Listing Decision: | List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Sources: | A Source Unknown |
Expected TMDL Completion Date: | 2035 |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant for Water Contact Recreation. Six of the eight samples exceed the objective, expressed as a statistical threshold value for the Water Contact Recreation use. Twelve of the twelve samples exceed the objective, expressed as a six-week rolling geometric mean for the Water Contact Recreation use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Twelve of the twelve samples exceed the objective, expressed as a six-week rolling geometric mean for the Water Contact Recreation use and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
Regional Board Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
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LOE ID: | 194581 | ||||
Pollutant: | Escherichia coli (E. coli) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Water Contact Recreation | ||||
Number of Samples: | 12 | ||||
Number of Exceedances: | 12 | ||||
Data and Information Type: | PATHOGEN MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed data for Rock Creek (Stanislaus County) to determine beneficial use support and the results are as follows: 12 of the 12 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a six-week rolling GEOMETRIC MEAN (GM) of Escherichia coli (E. coli) not to exceed 100 colony forming units per 100 milliliters (cfu/100 mL) (calculated weekly). | ||||
Objective/Criterion Reference: | Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site(s), station(s): 531STC001 | ||||
Temporal Representation: | The samples were collected between the days of 2015-07-14 and 2016-06-14 . | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
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LOE ID: | 194592 | ||||
Pollutant: | Escherichia coli (E. coli) | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Water Contact Recreation | ||||
Number of Samples: | 8 | ||||
Number of Exceedances: | 6 | ||||
Data and Information Type: | PATHOGEN MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed data for Rock Creek (Stanislaus County) to determine beneficial use support and the results are as follows: 6 of the 8 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a STATISTICAL THRESHOLD VALUE (STV) of 320 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly). | ||||
Objective/Criterion Reference: | Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site(s), station(s): 531STC001 | ||||
Temporal Representation: | The samples were collected between the days of 2015-07-14 and 2016-06-14 . | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
DECISION ID |
124582 |
Region 5 |
Rock Creek (Stanislaus County) |
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Pollutant: | Oxygen, Dissolved |
Final Listing Decision: | List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | New Decision |
Revision Status | Revised |
Sources: | A Source Unknown |
Expected TMDL Completion Date: | 2035 |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.2 of the Listing Policy. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of five of 15 samples exceed the water quality objective for the cold freshwater habitat beneficial use and five of 15 samples exceed the water quality objective for the fish spawning beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of five of 15 samples exceed the water quality objective for the cold freshwater habitat beneficial use and five of 15 samples exceed the water quality objective for the fish spawning beneficial use. This exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are met. |
Regional Board Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
State Board Review of Regional Board Conclusion and Recommendation: | |
State Board Decision Recommendation: | |
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LOE ID: | 208986 | ||||
Pollutant: | Oxygen, Dissolved | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Total | ||||
Beneficial Use: | Cold Freshwater Habitat | ||||
Number of Samples: | 15 | ||||
Number of Exceedances: | 5 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 5 of 15 samples exceeded the water quality threshold for Oxygen, Dissolved. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin) | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||
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LOE ID: | 208658 | ||||
Pollutant: | Oxygen, Dissolved | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Total | ||||
Beneficial Use: | Fish Spawning | ||||
Number of Samples: | 15 | ||||
Number of Exceedances: | 5 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | Water Board staff assessed SWAMP RWB5 Monitoring data for Rock Creek (Stanislaus County) to determine beneficial use support and results are as follows: 5 of 15 samples exceeded the water quality threshold for Oxygen, Dissolved. | ||||
Data Reference: | Field, Habitat, Toxicity, Water data for the 2020/2022 integrated report in Region 5. | ||||
SWAMP Data: | SWAMP | ||||
Water Quality Objective/Criterion: | The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin) | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments) | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | The samples were collected at 1 monitoring site (531STC001) | ||||
Temporal Representation: | The samples were collected between the dates of 2015-07-14 and 2016-06-14 | ||||
Environmental Conditions: | |||||
QAPP Information: | SWAMP QAPrP 2008 | ||||
QAPP Information Reference(s): | Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program | ||||